CN206222820U - A kind of natural gas liquefaction system of carbon dioxide precooling double-stage nitrogen expansion - Google Patents
A kind of natural gas liquefaction system of carbon dioxide precooling double-stage nitrogen expansion Download PDFInfo
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- CN206222820U CN206222820U CN201621176617.XU CN201621176617U CN206222820U CN 206222820 U CN206222820 U CN 206222820U CN 201621176617 U CN201621176617 U CN 201621176617U CN 206222820 U CN206222820 U CN 206222820U
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Abstract
The utility model discloses a kind of natural gas liquefaction system of carbon dioxide precooling double-stage nitrogen expansion, it includes：Gas delivering pipe, carbon dioxide precooling EGR, de-heavy hydrocarbon apparatus, double-stage nitrogen air cooling EGR, BOG heat exchangers, first throttle valve, second throttle, LNG choke valves, gas-liquid separation device, LNG pump and LNG storage tank, the utility model is realized precooling and realizes that depth is cooled down by nitrogen by carbon dioxide, and the technological process to carbon dioxide precooling double-stage nitrogen expansion liquefaction system is optimized design, not only increase technological flexibility, also reduce the energy ezpenditure of liquefaction system, improve security, different waters can be realized, marine liquefied natural gas stabilization under the conditions of different makings, efficiently, lasting Production requirement.
Description
Technical field
The utility model is related to area of natural gas liquefaction, in particular to a kind of expansion of carbon dioxide precooling double-stage nitrogen
Natural gas liquefaction system.
Background technology
Natural gas resource is widely distributed in the land in the whole world and ocean, is world's oil-gas exploration and development from land to ocean
Inexorable trend.FLNG (Floating Liquefied Natural Gas) is ocean engineering circle proposition in recent years, liquid collecting
Change the new offshore installation that production, storage and the handling of natural gas are integrated, there is cost of investment for the exploitation of offshore gas field
Low, construction period is short, development risk is small, is easy to the features such as migrating.
Operation on the sea need to consider the unfavorable factors such as typhoon, wave, space limitation so that the technical difficulty of Floating Liquefied technique
Higher than land.As the core technology of FLNG, cost of investment, operating cost, the fortune of the reasonability of liquefaction process to engineering project
Battalion's reliability and production safety are most important.Nitrogen expansion liquefaction flow path tool is found for the particularity of marine operating mode, after research
There is prominent seaworthiness.
Fig. 1 is existing Floating Liquefied technology propane pre-cooling dinitrogen expansion natural gas liquefaction system schematic diagram；Code name in Fig. 1
Implication is as follows：11 is high temperature nitrogen cycle expanding machine, and 12 is low temperature nitrogen cycle expanding machine, and 2 is propane compressor, and 31,32 are height
Warm nitrogen cycle compressor, 41,42 are cryogenic nitrogen recycle compressor, and 51-56 is water cooler, and 61-63 is J/T valves, 71-
73 are gas-liquid separator, and 8 is rectifying column, and 74 is gas-liquid separator.
Fig. 1 is existing Floating Liquefied technology propane pre-cooling dinitrogen expansion natural gas liquefaction system, wherein being made using propane
It is refrigerant, and usage amount is larger, due to the low boiling point of propane, easily vaporization, thus when driving and parking is operated, equipment and pipeline
In there are a large amount of propane and can cause pressure rise, the risk that increase propane is released or leaked.Once leak, due to propane
Density is more than air, can cause the accumulation of fuel gas, and FLNG Texas decks space is limited, facility compact, diffusion conditions
, easily there is the accidents such as burning, blast in difference.For floating natural gas liquefaction system, reduce and avoid the use of propane can carry
High security, reduces the investment of safety devices.
The yield and component of offshore gas field natural gas constantly change, and external environment condition has in change, and FLNG devices all the time
Have transportable property, this requires that floating natural gas liquefaction system has controllability, can realize as the case may be precooling zone,
The regulation of liquefaction stages load, reduces heat transfer temperature difference, reduces liquefaction power consumption.High temperature nitrogen cycle and low temperature nitrogen cycle pressure in the prior art
Power is identical, and flow scheme design cannot adjust the heat transfer temperature difference of different warm areas, and controllability is poor, causes the environmental suitability of FLNG devices
With the reduction of unstripped gas adaptability, it is unfavorable for the production of stability and high efficiency.
After expanded machine supercharger and compressor boost, nitrogen pressure is up to more than 5MPa, pressure of equipment and pipeline etc.
Level is high, and wall thickness increase, the weight of process equipment increases, and causing the load-carrying of the supporting constructions such as pipe support increases, and to Ship Structure
The cost of the proposition requirements at the higher level such as intensity, top technical module and hull is substantially increased so that floating natural gas liquefaction device
Investment increase, economy reduction.
In summary, existing floating liquefaction Technology of Natural Gas has that security is low, controllability is poor, high energy consumption, economy
Property difference shortcoming.
Utility model content
The utility model provides a kind of natural gas liquefaction system of carbon dioxide precooling double-stage nitrogen expansion, is used to improve natural
The seaworthiness and technological flexibility of gas liquefaction system, realize that stable, efficient, the lasting production of marine liquefied natural gas is needed
Ask.
In order to achieve the above object, the utility model provides a kind of natural gas liquid of carbon dioxide precooling double-stage nitrogen expansion
Change system, it includes：Gas delivering pipe, carbon dioxide precooling EGR, de-heavy hydrocarbon apparatus, double-stage nitrogen air cooling circulation dress
Put, BOG heat exchangers, first throttle valve, second throttle, LNG choke valves, gas-liquid separation device, LNG pump and LNG storage tank, its
In：
The carbon dioxide precooling EGR include the main cryogenic heat exchanger of multi-stage precooling, multistage carbon-dioxide gas compressor and
Multistage carbon-dioxide gas compressor water cooler, the main cryogenic heat exchanger of multi-stage precooling is connected with the gas delivering pipe, dioxy
Change carbon compressor equal with the number of carbon-dioxide gas compressor water cooler, and the rear end of each carbon-dioxide gas compressor is equipped with
One carbon-dioxide gas compressor water cooler, carbon dioxide is by multistage carbon-dioxide gas compressor supercharging and multistage carbon-dioxide gas compressor
The first design temperature is cooled to after water cooler cooling, the carbon dioxide of first design temperature is by BOG heat exchangers, described
The main cryogenic heat exchanger of multi-stage precooling is delivered to after first throttle valve and the second throttle respectively, with gas delivering pipe
The natural gas for flowing through carries out precooling, the carbon dioxide that natural gas is carried out after precooling is again passed by multistage carbon-dioxide gas compressor and
Multistage carbon-dioxide gas compressor water cooler, to realize circulating precooling；
The de-heavy hydrocarbon apparatus are arranged on the rear end of the carbon dioxide precooling EGR, by by the natural gas of precooling
It is separated into the heavy hydrocarbon component and gaseous light hydrocarbon component of liquid；
The double-stage nitrogen air cooling EGR includes the main cryogenic heat exchanger of multistage deep cooling, low-pressure nitrogen precooling module, height
Press nitrogen precooled module, high pressure nitrogen expanding machine and low-pressure nitrogen expanding machine, the multistage main cryogenic heat exchanger of deep cooling and the de- weight
Hydrocarbon device is connected, to carry out depth cooling, the low-pressure nitrogen precooling module to the natural gas exported from the de-heavy hydrocarbon apparatus
Including a low-pressure nitrogen expanding machine supercharger, a low-pressure nitrogen expanding machine supercharger water cooler, multistage low-pressure nitrogen compressor and
Multistage low-pressure nitrogen compressor water cooler, the high pressure nitrogen precooling module includes a high pressure nitrogen expanding machine supercharger, high
Pressure nitrogen expansion machine supercharger water cooler, multistage pressure nitrogen compressor and multistage pressure nitrogen compressor water cooler, low pressure nitrogen
The number of air compressor and low-pressure nitrogen compressor water cooler is equal, high pressure nitrogen compressor and high pressure nitrogen compressor water cooler
Number it is equal, the high pressure nitrogen precooling module is divided into two-way after nitrogen is compressed into the first predetermined pressure, wherein passing through all the way
Cross the main cryogenic heat exchanger of the multi-stage precooling to be cooled down, another road is cooled down by the main cryogenic heat exchanger of first order deep cooling,
Nitrogen after two-way cooling is expanded after converging by the high pressure nitrogen expanding machine, and the low-temp low-pressure nitrogen after expansion backflows
To part of the multistage main cryogenic heat exchanger of deep cooling in addition to afterbody, with cooled natural gas, low-pressure nitrogen and partial high pressure
Be compressed to after the second predetermined pressure nitrogen by other levels in addition to afterbody by nitrogen, the low-pressure nitrogen precooling module
Other main cryogenic heat exchanger of deep cooling is input into the low-pressure nitrogen expanding machine and carries out expansion cooling again after being cooled down, low after expansion
Warm low-pressure nitrogen backflows to the main cryogenic heat exchanger of afterbody deep cooling；
The LNG choke valves are connected between the double-stage nitrogen air cooling EGR and the gas-liquid separation device, institute
State gas-liquid separation device and the BOG that liquefied natural gas flash distillation is produced is delivered to the BOG heat exchangers, so that what throttling flash distillation was produced
The further cooled carbon dioxides of BOG, the BOG heat exchangers are further exported to fuel gas system BOG；
The LNG pump is connected between the gas-liquid separation device and the LNG storage tank, for liquefied natural gas to be conveyed
Stored to the LNG storage tank.
In an embodiment of the present utility model, natural qi exhaustion solid is sequentially communicated before the gas delivering pipe
Grain device, natural gas sweetening plant, natual gas dehydrate unit, removing benzene from natural gas device and natural gas mercury-removing device, will enter
Enter the solid particle in the natural gas in it, sour gas, water, benzene and mercury to filter successively.
In an embodiment of the present utility model, carbon-dioxide gas compressor water cooler will be by previous stage carbon dioxide compression
Carbon dioxide after machine compression is cooled to 35 DEG C, is increased to by the pressure of carbon dioxide after multistage carbon-dioxide gas compressor
8.5MPa, -16 DEG C are reduced to by the temperature of carbon dioxide after BOG heat exchangers and first throttle valve, by after second throttle two
The temperature of carbonoxide is reduced to -53 DEG C, and pressure is reduced to 0.6MPa.
In an embodiment of the present utility model, first predetermined pressure is 4MPa.
In an embodiment of the present utility model, second predetermined pressure is 2.5MPa.
In an embodiment of the present utility model, the main cryogenic heat exchanger of multi-stage precooling and the main cryogenic heat exchanger of multistage deep cooling are equal
Using uniform fluid distribution component.
In an embodiment of the present utility model, in low-pressure nitrogen precooling module, low-pressure nitrogen expanding machine supercharger water-cooled
Device and multistage low-pressure nitrogen compressor water cooler will be by previous stage low-pressure nitrogen expanding machine supercharger or low-pressure nitrogen compressors
Nitrogen after compression is cooled to 35 DEG C.
In an embodiment of the present utility model, in high pressure nitrogen precooling module, high pressure nitrogen expanding machine supercharger water-cooled
Device and multistage pressure nitrogen compressor water cooler will be by previous stage high pressure nitrogen expanding machine supercharger or high pressure nitrogen compressors
Nitrogen after compression is cooled to 35 DEG C.
In an embodiment of the present utility model, the main cryogenic heat exchanger of precooling be two-stage, carbon-dioxide gas compressor supercharging and
Carbon-dioxide gas compressor water cooler is two-stage.
In an embodiment of the present utility model, low-pressure nitrogen compressor, low-pressure nitrogen compressor water cooler, high pressure nitrogen
Compressor and high pressure nitrogen compressor water cooler are two-stage.
The natural gas liquefaction system of the carbon dioxide precooling double-stage nitrogen expansion that the utility model is provided has advantages below：
(1) technological process to carbon dioxide precooling double-stage nitrogen expansion liquefaction system is optimized design, to elevated pressure nitrogen
Temperature, low-pressure nitrogen before atmospheric pressure, low-pressure nitrogen pressure, pressure carbon dioxide, carbon dioxide precooling temperature, high pressure nitrogen expansion
The parameter such as temperature is optimized before expansion, improves technological flexibility.
(2) energy ezpenditure of liquefaction system is reduced, can be according to the composition of unstripped gas, temperature, pressure, project construction ground
The change of point environment temperature, the marine thermic load for rocking operating mode, reasonable distribution pre-cooling cycle and major cycle, improve liquefaction system
The seaworthiness of system, with important construction value, marine liquefaction is natural under the conditions of can realizing different waters, different makings
Stable, efficient, the lasting Production requirement of gas.
(3) to different makings conditions and marine environment, liquefied fraction can reach 96%, compared to dinitrogen inflation fluid chemical industry
Skill lower power consumption about 10%, the ratio power consumption with propane pre-cooling dinitrogen expansion liquefaction process is suitable, and liquefaction energy consumption is substantially reduced.
(4) liquefaction process is expanded compared to existing propane pre-cooling dinitrogen, the utility model avoids the use of propane, carries
Security high, reduces the investment of safety devices；Reduce the pressure rating of nitrogen system, so as to reduce technical module and
The cost of investment of hull, improves the economy of floating natural gas liquefaction device.
Brief description of the drawings
In order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art, below will be to embodiment
Or the accompanying drawing to be used needed for description of the prior art is briefly described, it should be apparent that, drawings in the following description are only
It is some embodiments of the present utility model, for those of ordinary skill in the art, is not paying the premise of creative work
Under, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the schematic diagram of existing Floating Liquefied technology propane pre-cooling dinitrogen expansion natural gas liquefaction system；
The signal of the natural gas liquefaction system that Fig. 2 expands for the carbon dioxide precooling double-stage nitrogen of the embodiment of the utility model one
Figure；
Fig. 3 is the runner arrangement schematic diagram of heat exchanging part in the embodiment of the utility model one.
Description of reference numerals：1- gas delivering pipes；2- carbon dioxide precooling EGRs；3- de-heavy hydrocarbon apparatus；4- is double
Level nitrogen cooling-cycle device；5-BOG heat exchangers；6- first throttle valves；7- second throttle；8-LNG choke valves；9- gas-liquids point
From device；101-LNG pumps；102-LNG storage tanks；11st, the main cryogenic heat exchanger of 12- precoolings；31st, 32,33- carbon-dioxide gas compressors；
61st, 62,63- carbon-dioxide gas compressor water coolers；13rd, 14, the main cryogenic heat exchanger of 15- deep coolings；401- low-pressure nitrogen precooling modules；
402- high pressure nitrogen precooling modules；71- high pressure nitrogen expanding machines；72- low-pressure nitrogen expanding machines.
Specific embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the utility model, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is paid
The every other embodiment for being obtained, belongs to the scope of the utility model protection.
The signal of the natural gas liquefaction system that Fig. 2 expands for the carbon dioxide precooling double-stage nitrogen of the embodiment of the utility model one
Figure, as illustrated, the natural gas liquefaction system that the carbon dioxide precooling double-stage nitrogen that the utility model is provided expands includes：Natural gas
Delivery pipe 1, carbon dioxide precooling EGR 2, de-heavy hydrocarbon apparatus 3, double-stage nitrogen air cooling EGR 4, BOG heat exchangers 5,
One choke valve 6, second throttle 7, LNG choke valves 8, gas-liquid separation device 9, LNG pump 101 and LNG storage tank 102, wherein：
Carbon dioxide precooling EGR 2 includes the main cryogenic heat exchanger of two-stage precooling (11,12), three-level carbon dioxide compression
Machine (31,32,33) and three-level carbon-dioxide gas compressor water cooler (61,62,63), the main cryogenic heat exchanger 11,12 of two-stage precooling with
Gas delivering pipe 1 is connected, and the rear end of each carbon-dioxide gas compressor is equipped with a carbon-dioxide gas compressor water cooler, i.e. dioxy
The rear end for changing carbon compressor 31 is provided with carbon-dioxide gas compressor water cooler 61, and the rear end of carbon-dioxide gas compressor 32 is provided with titanium dioxide
Carbon compressor water cooler 62, the rear end of carbon-dioxide gas compressor 33 is provided with carbon-dioxide gas compressor water cooler 63, carbon dioxide warp
After crossing three-level carbon-dioxide gas compressor (31,32,33) supercharging and three-level carbon-dioxide gas compressor water cooler (61,62,63) cooling
35 DEG C are cooled to, 35 DEG C of the carbon dioxide is conveyed respectively by after BOG heat exchangers 5, first throttle valve 6 and second throttle 7
To the main cryogenic heat exchanger of two-stage precooling (11,12), precooling is carried out with to the natural gas flowed through in gas delivering pipe 1, to natural
The carbon dioxide that gas is carried out after precooling again passes by three-level carbon-dioxide gas compressor (31,32,33) and multistage carbon dioxide compression
Machine water cooler (61,62,63), to realize circulating precooling；
De-heavy hydrocarbon apparatus 3 are arranged on the rear end of carbon dioxide precooling EGR 2, will be separated into by the natural gas of precooling
The heavy hydrocarbon component of liquid and gaseous light hydrocarbon component, remove C4Above component；
Double-stage nitrogen air cooling EGR 4 includes the main cryogenic heat exchanger of three-level deep cooling (13,14,15), low-pressure nitrogen precooling
Module 401, high pressure nitrogen precooling module 402, high pressure nitrogen expanding machine 71 and low-pressure nitrogen expanding machine 72, the main low temperature of three-level deep cooling
Heat exchanger (13,14,15) is connected with de-heavy hydrocarbon apparatus 3, and depth cooling is carried out with to the natural gas exported from de-heavy hydrocarbon apparatus 3,
Low-pressure nitrogen precooling module 41 includes a low-pressure nitrogen expanding machine supercharger 51, a low-pressure nitrogen expanding machine supercharger water cooler
67th, two-stage low-pressure nitrogen compressor (52,53) and two-stage low-pressure nitrogen compressor water cooler (68,69), the pre- chill of high pressure nitrogen
Block 402 includes a high pressure nitrogen expanding machine supercharger 41, a high pressure nitrogen expanding machine supercharger water cooler 64, two-stage high pressure nitrogen
Compressor (42,43) and two-stage high pressure nitrogen compressor water cooler (65,66).
High pressure nitrogen precooling module 402 is divided into two-way after nitrogen is compressed into 4MPa, wherein all the way by two-stage precooling master
Cryogenic heat exchanger (11,12) is cooled to -50 DEG C, and pressure is changed into 3.95MPa, and another road is by the main cryogenic heat exchanger of first order deep cooling
13 are cooled to -50 DEG C, and the nitrogen after two-way cooling carries out being expanded to 0.72MPa after converging by high pressure nitrogen expansion machine 71, temperature
Degree is reduced to -130 DEG C, and the low-temp low-pressure nitrogen after expansion backflows to the main cryogenic heat exchanger 14,13 of deep cooling, with cooled natural gas, low
Pressure nitrogen and partial high pressure nitrogen.
In high pressure nitrogen precooling module 402, high pressure nitrogen expanding machine supercharger water cooler 64 and two-stage high pressure nitrogen compress
Machine water cooler 65,66 is by after previous stage high pressure nitrogen expanding machine supercharger 41 or high pressure nitrogen compressor 42,43 compress
Nitrogen is cooled to 35 DEG C.
Low-pressure nitrogen precooling module 401 nitrogen is compressed to after 2.5MPa be cooled to by the main cryogenic heat exchanger 13 of deep cooling-
55 DEG C, -120 DEG C are cooled to through the main cryogenic heat exchanger 14 of deep cooling, after carry out expansion cooling, pressure through low-pressure nitrogen expanding machine 72
0.72MPa is down to, temperature is reduced to -163 DEG C, the low-temp low-pressure nitrogen after expansion backflows to the main cryogenic heat exchanger of afterbody deep cooling
15, then by after the main cryogenic heat exchanger 14,13 of deep cooling, temperature rises to 32 DEG C, then again through low-pressure nitrogen precooling module 401 again
2.5MPa is compressed to, is so moved in circles.
In low-pressure nitrogen precooling module 401, low-pressure nitrogen expanding machine supercharger water cooler 67 and two-stage low-pressure nitrogen compress
Machine water cooler 68,69 is by by the nitrogen after previous stage low-pressure nitrogen expanding machine supercharging 51 or the compression of low-pressure nitrogen compressor 52,53
Air cooling is to 35 DEG C.
LNG choke valves 8 are connected between double-stage nitrogen air cooling EGR 4 and gas-liquid separation device 9, gas-liquid separation device
The BOG that liquefied natural gas flash distillation is produced is delivered to BOG heat exchangers 5 by 9, so that the BOG further coolings two that throttling flash distillation is produced
Carbonoxide, BOG heat exchangers 5 are further exported to fuel gas system BOG；
LNG pump 101 is connected between gas-liquid separation device 9 and LNG storage tank 102, for liquefied natural gas to be transported into LNG
Storage tank 102 is stored, and waits on the berth outer defeated.
Can also be sequentially communicated in the utility model, before gas delivering pipe natural qi exhaustion solid particle device,
Natural gas sweetening plant, natual gas dehydrate unit, removing benzene from natural gas device and natural gas mercury-removing device, will enter in it
Solid particle, sour gas, water, benzene and mercury in natural gas are filtered successively.
As shown in Fig. 2 each carbon-dioxide gas compressor water cooler (61,62,63) will be by previous stage pressurized carbon dioxide
Carbon dioxide after contracting machine (31,32,33) compression is cooled to 35 DEG C, by two after three-level carbon-dioxide gas compressor (31,32,33)
The pressure of carbonoxide increases to 8.5MPa, and -16 are reduced to by the temperature of carbon dioxide after BOG heat exchangers 5 and first throttle valve 6
DEG C, -53 DEG C are reduced to by the temperature of carbon dioxide after second throttle 7, pressure is reduced to 0.6MPa.
Fig. 3 is the runner arrangement schematic diagram of heat exchanging part in the embodiment of the utility model one, as illustrated, runner 21,22
It is liquefaction process of the unstripped gas in main cryogenic heat exchanger, runner 23,24 is cooling unstripped gas and high pressure after carbon dioxide throttling
The process of nitrogen, runner 25,26 be high pressure nitrogen in main cryogenic heat exchanger by the process of precooling, runner 27 is the height after expansion
The process of the high pressure nitrogen of pressure nitrogen cooling unstripped gas, low-pressure nitrogen and high temperature, runner 28 is low-pressure nitrogen in main low-temperature heat exchange
By the process of precooling in device, runner 29 is the process of low-pressure nitrogen cooling unstripped gas, low-pressure nitrogen and high pressure nitrogen after expansion.
Main cryogenic heat exchanger may be selected plate-fin heat exchanger and wound tube heat exchanger, and particular type is according to single line yield, project situation point
Analysis determines.
The main cryogenic heat exchanger of two-stage precooling and the main cryogenic heat exchanger of three-level deep cooling in the utility model is equal using fluid
Cloth component, to optimize internal heat structure, ensure that heat transfer process is stable, efficient.
The natural gas liquefaction system of the carbon dioxide precooling double-stage nitrogen expansion that the utility model is provided has advantages below：
(1) technological process to carbon dioxide precooling double-stage nitrogen expansion liquefaction system is optimized design, to elevated pressure nitrogen
Temperature, low-pressure nitrogen before atmospheric pressure, low-pressure nitrogen pressure, pressure carbon dioxide, carbon dioxide precooling temperature, high pressure nitrogen expansion
The parameter such as temperature is optimized before expansion, improves technological flexibility.
(2) energy ezpenditure of liquefaction system is reduced, can be according to the composition of unstripped gas, temperature, pressure, project construction ground
The change of point environment temperature, the marine thermic load for rocking operating mode, reasonable distribution pre-cooling cycle and major cycle, improve liquefaction system
The seaworthiness and technological flexibility of system, with important construction value, under the conditions of can realizing different waters, different makings
Stable, efficient, the lasting Production requirement of marine liquefied natural gas.
(3) to different makings conditions and marine environment, liquefied fraction can reach 96%, compared to dinitrogen inflation fluid chemical industry
Skill lower power consumption about 10%, the ratio power consumption with propane pre-cooling dinitrogen expansion liquefaction process is suitable, and liquefaction energy consumption is substantially reduced.
(4) liquefaction process is expanded compared to existing propane pre-cooling dinitrogen, the utility model avoids the use of propane, carries
Security high, reduces the investment of safety devices；Reduce the pressure rating of nitrogen system, so as to reduce technical module and
The cost of investment of hull, improves the economy of floating natural gas liquefaction device.
One of ordinary skill in the art will appreciate that：Accompanying drawing is the schematic diagram of one embodiment, module in accompanying drawing or
Flow is not necessarily implemented necessary to the utility model.
One of ordinary skill in the art will appreciate that：The module in device in embodiment can be according to embodiment description point
It is distributed in the device of embodiment, it is also possible to carry out respective change and be disposed other than in one or more devices of the present embodiment.On
Stating the module of embodiment can merge into a module, it is also possible to be further split into multiple submodule.
Finally it should be noted that：Above example is only used to illustrate the technical solution of the utility model, rather than its limitations；
Although being described in detail to the utility model with reference to the foregoing embodiments, it will be understood by those within the art that：
It can still be modified to the technical scheme described in previous embodiment, or which part technical characteristic is equal to
Replace；And these modifications or replacement, the essence of appropriate technical solution is departed from the utility model embodiment technical scheme
Spirit and scope.
Claims (10)
1. the natural gas liquefaction system that a kind of carbon dioxide precooling double-stage nitrogen expands, it is characterised in that including：Natural gas transportation
Pipe, carbon dioxide precooling EGR, de-heavy hydrocarbon apparatus, double-stage nitrogen air cooling EGR, BOG heat exchangers, first throttle valve,
Second throttle, LNG choke valves, gas-liquid separation device, LNG pump and LNG storage tank, wherein：
The carbon dioxide precooling EGR includes the main cryogenic heat exchanger of multi-stage precooling, multistage carbon-dioxide gas compressor and multistage
Carbon-dioxide gas compressor water cooler, the main cryogenic heat exchanger of multi-stage precooling is connected with the gas delivering pipe, carbon dioxide
Compressor is equal with the number of carbon-dioxide gas compressor water cooler, and the rear end of each carbon-dioxide gas compressor is equipped with one or two
Carbonoxide compressor water cooler, carbon dioxide is by multistage carbon-dioxide gas compressor supercharging and multistage carbon-dioxide gas compressor water-cooled
The first design temperature is cooled to after device cooling, the carbon dioxide of first design temperature is by the BOG heat exchangers, described first
The main cryogenic heat exchanger of multi-stage precooling is delivered to after choke valve and the second throttle respectively, with to being flowed through in gas delivering pipe
Natural gas carry out precooling, multistage carbon-dioxide gas compressor and multistage are again passed by the carbon dioxide that natural gas is carried out after precooling
Carbon-dioxide gas compressor water cooler, to realize circulating precooling；
The de-heavy hydrocarbon apparatus are arranged on the rear end of the carbon dioxide precooling EGR, will be separated by the natural gas of precooling
It is the heavy hydrocarbon component and gaseous light hydrocarbon component of liquid；
The double-stage nitrogen air cooling EGR includes the main cryogenic heat exchanger of multistage deep cooling, low-pressure nitrogen precooling module, elevated pressure nitrogen
Gas precooling module, high pressure nitrogen expanding machine and low-pressure nitrogen expanding machine, the multistage main cryogenic heat exchanger of deep cooling are filled with the de- heavy hydrocarbon
Connection is put, to carry out depth cooling to the natural gas exported from the de-heavy hydrocarbon apparatus, the low-pressure nitrogen precooling module includes
One low-pressure nitrogen expanding machine supercharger, a low-pressure nitrogen expanding machine supercharger water cooler, multistage low-pressure nitrogen compressor and multistage
Low-pressure nitrogen compressor water cooler, the high pressure nitrogen precooling module includes a high pressure nitrogen expanding machine supercharger, an elevated pressure nitrogen
Gas expanding machine supercharger water cooler, multistage pressure nitrogen compressor and multistage pressure nitrogen compressor water cooler, low pressure nitrogen air pressure
The number of contracting machine and low-pressure nitrogen compressor water cooler is equal, the number of high pressure nitrogen compressor and high pressure nitrogen compressor water cooler
Mesh is equal, and the high pressure nitrogen precooling module is divided into two-way after nitrogen is compressed into the first predetermined pressure, wherein all the way by institute
State the main cryogenic heat exchanger of multi-stage precooling to be cooled down, another road is cooled down by the main cryogenic heat exchanger of first order deep cooling, two-way
Nitrogen after cooling is expanded after converging by the high pressure nitrogen expanding machine, and the low-temp low-pressure nitrogen after expansion backflows at most
Part of the level main cryogenic heat exchanger of deep cooling in addition to afterbody, with cooled natural gas, low-pressure nitrogen and partial high pressure nitrogen,
Be compressed to after the second predetermined pressure nitrogen by other ranks in addition to afterbody by the low-pressure nitrogen precooling module
The main cryogenic heat exchanger of deep cooling is input into the low-pressure nitrogen expanding machine and carries out expansion cooling again after being cooled down, the low temperature after expansion is low
Pressure nitrogen backflows to the main cryogenic heat exchanger of afterbody deep cooling；
The LNG choke valves are connected between the double-stage nitrogen air cooling EGR and the gas-liquid separation device, the gas
The BOG that liquefied natural gas flash distillation is produced is delivered to the BOG heat exchangers by liquid separating apparatus, so that the BOG that throttling flash distillation is produced
Further cooled carbon dioxide, the BOG heat exchangers are further exported to fuel gas system BOG；
The LNG pump is connected between the gas-liquid separation device and the LNG storage tank, for liquefied natural gas to be transported into institute
LNG storage tank is stated to be stored.
2. the natural gas liquefaction system that carbon dioxide precooling double-stage nitrogen according to claim 1 expands, it is characterised in that institute
Natural qi exhaustion solid particle device, natural gas sweetening plant, gas dehydration have been sequentially communicated before stating gas delivering pipe
Device, removing benzene from natural gas device and natural gas mercury-removing device, solid particle, sour gas in the natural gas that will enter in it
Body, water, benzene and mercury are filtered successively.
3. the natural gas liquefaction system that carbon dioxide precooling double-stage nitrogen according to claim 1 expands, it is characterised in that two
Carbonoxide compressor water cooler will be cooled to 35 DEG C by the carbon dioxide after the compression of previous stage carbon-dioxide gas compressor, through excessive
The pressure of carbon dioxide increases to 8.5MPa after grade carbon-dioxide compressor, by dioxy after BOG heat exchangers and first throttle valve
The temperature for changing carbon is reduced to -16 DEG C, and -53 DEG C are reduced to by the temperature of carbon dioxide after second throttle, and pressure is reduced to 0.6MPa.
4. the natural gas liquefaction system that carbon dioxide precooling double-stage nitrogen according to claim 1 expands, it is characterised in that institute
The first predetermined pressure is stated for 4MPa.
5. the natural gas liquefaction system that carbon dioxide precooling double-stage nitrogen according to claim 1 expands, it is characterised in that institute
The second predetermined pressure is stated for 2.5MPa.
6. the natural gas liquefaction system that carbon dioxide precooling double-stage nitrogen according to claim 1 expands, it is characterised in that many
The level main cryogenic heat exchanger of precooling and the main cryogenic heat exchanger of multistage deep cooling use uniform fluid distribution component.
7. the natural gas liquefaction system that carbon dioxide precooling double-stage nitrogen according to claim 1 expands, it is characterised in that low
Press in nitrogen precooled module, low-pressure nitrogen expanding machine supercharger water cooler and multistage low-pressure nitrogen compressor water cooler will be by preceding
Nitrogen after one-level low-pressure nitrogen expanding machine supercharger or low-pressure nitrogen compressor compresses is cooled to 35 DEG C.
8. the natural gas liquefaction system that carbon dioxide precooling double-stage nitrogen according to claim 1 expands, it is characterised in that high
Press in nitrogen precooled module, high pressure nitrogen expanding machine supercharger water cooler and multistage pressure nitrogen compressor water cooler will be by preceding
Nitrogen after one-level high pressure nitrogen expanding machine supercharger or high pressure nitrogen compressor compresses is cooled to 35 DEG C.
9. the natural gas liquefaction system that carbon dioxide precooling double-stage nitrogen according to claim 1 expands, it is characterised in that pre-
Cold main cryogenic heat exchanger is two-stage, and carbon-dioxide gas compressor supercharging and carbon-dioxide gas compressor water cooler are two-stage.
10. the natural gas liquefaction system that the carbon dioxide precooling double-stage nitrogen according to claim any one of 1-9 expands, it is special
Levy and be, low-pressure nitrogen compressor, low-pressure nitrogen compressor water cooler, high pressure nitrogen compressor and high pressure nitrogen compressor water-cooled
Device is two-stage.
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| CN201621176617.XU CN206222820U (en) | 2016-11-02 | 2016-11-02 | A kind of natural gas liquefaction system of carbon dioxide precooling double-stage nitrogen expansion |
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| CN201621176617.XU CN206222820U (en) | 2016-11-02 | 2016-11-02 | A kind of natural gas liquefaction system of carbon dioxide precooling double-stage nitrogen expansion |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106440656A (en) * | 2016-11-02 | 2017-02-22 | 中国寰球工程有限公司 | Natural gas liquefying system for carbon dioxide precooling double-stage nitrogen expansion |
| CN109386735A (en) * | 2017-08-08 | 2019-02-26 | 中国石油化工股份有限公司 | A kind of joint processing system and technique for BOG and carbon dioxide zero discharge |
-
2016
- 2016-11-02 CN CN201621176617.XU patent/CN206222820U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106440656A (en) * | 2016-11-02 | 2017-02-22 | 中国寰球工程有限公司 | Natural gas liquefying system for carbon dioxide precooling double-stage nitrogen expansion |
| CN106440656B (en) * | 2016-11-02 | 2022-02-15 | 中国寰球工程有限公司 | Carbon dioxide precooling two-stage nitrogen expansion natural gas liquefaction system |
| CN109386735A (en) * | 2017-08-08 | 2019-02-26 | 中国石油化工股份有限公司 | A kind of joint processing system and technique for BOG and carbon dioxide zero discharge |
| CN109386735B (en) * | 2017-08-08 | 2020-10-16 | 中国石油化工股份有限公司 | Combined treatment system and process for zero emission of BOG and carbon dioxide |
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